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300 参数 Datasheet PDF下载

300图片预览
型号: 300
PDF下载: 下载PDF文件 查看货源
内容描述: 赛扬D处理器 [Celeron D Processor]
分类和应用:
文件页数/大小: 95 页 / 2070 K
品牌: INTEL [ INTEL ]
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Thermal Specifications and Design Considerations  
When calculating a temperature based on thermal diode measurements, a number of  
parameters must be either measured or assumed. Most devices measure the diode  
ideality and assume a series resistance and ideality trim value, although some are  
capable of also measuring the series resistance. Calculating the temperature is then  
accomplished using the equations listed under Table 30. In most temperature sensing  
devices, an expected value for the diode ideality is designed-in to the temperature  
calculation equation. If the designer of the temperature sensing device assumes a  
perfect diode the ideality value (also called ntrim) will be 1.000. Given that most diodes  
are not perfect, the designers usually select a ntrim value that more closely matches the  
behavior of the diodes in the processor. If the processors diode ideality deviates from  
that of ntrim, each calculated temperature will be offset by a fixed amount. This  
temperature offset can be calculated with the equation:  
Terror(nf) = Tmeasured X (1 – nactual/ntrim  
)
Where Terror(nf) is the offset in degrees C, Tmeasured is in Kelvin, nactual is the measured  
ideality of the diode, and ntrim is the diode ideality assumed by the temperature  
sensing device.  
To improve the accuracy of diode based temperature measurements, a new register  
containing Thermal Diode Offset data has been added to the Celeron D processor.  
During manufacturing, each processors thermal diode will be evaluated for its behavior  
relative to a theoretical diode. Using the equation above, the temperature error created  
by the difference between ntrim and the actual ideality of the particular processor will  
be calculated. This Thermal Diode Offset value will be programmed in to the new diode  
correction MSR and when added to the Thermal Diode Base value can be used to  
correct temperatures read by diode based temperature sensing devices.  
If the ntrim value used to calculate the Thermal Diode Offset differs from the ntrim value  
used in a temperature sensing device, the Terror(nf) may not be accurate. If desired, the  
Thermal Diode Offset can be adjusted by calculating nactual and then recalculating the  
offset using the actual ntrim as defined in the temperature sensor manufacturers'  
datasheet.  
The Diode_Base value and ntrim used to calculate the Diode_Correction_Offset are  
listed in Table 32.  
Table 32.  
Table 33.  
Thermal “Diode” ntrim and Diode_Correction_Offset  
Symbol  
Parameter  
Unit  
Diode ideality used to calculate Diode_Offset  
Diode Base  
1.008  
0
n
trim  
Diode_Base  
C
Thermal Diode Interface  
Signal Name  
Land Number  
Signal Description  
THERMDA  
THERMDC  
AL1  
AK1  
diode anode  
diode cathode  
§ §  
Datasheet  
83  
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